Matrices meeting the determinant bound with equality have become known as Hadamard matrices. There is a
substantial literature devoted to Hadamard matrices; we refer the reader to three monographs which have appeared in the past 15 years for
further details, [1]}, [2]}, [3]}. Existence of Hadamard matrices is well-studied. The
following omnibus result provides references to some well-known constructions of Hadamard matrices.
